EP0197388B1 - Verfahren und Vorrichtung zum Verdichten von Giessereiformstoffen - Google Patents

Verfahren und Vorrichtung zum Verdichten von Giessereiformstoffen Download PDF

Info

Publication number
EP0197388B1
EP0197388B1 EP86103822A EP86103822A EP0197388B1 EP 0197388 B1 EP0197388 B1 EP 0197388B1 EP 86103822 A EP86103822 A EP 86103822A EP 86103822 A EP86103822 A EP 86103822A EP 0197388 B1 EP0197388 B1 EP 0197388B1
Authority
EP
European Patent Office
Prior art keywords
frame
moulding
compacting
sand
molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP86103822A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0197388A2 (de
EP0197388A3 (en
Inventor
Dietmar Prof. Dr.-Ing. Boenisch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer AG
Original Assignee
Georg Fischer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Georg Fischer AG filed Critical Georg Fischer AG
Priority to AT86103822T priority Critical patent/ATE58659T1/de
Publication of EP0197388A2 publication Critical patent/EP0197388A2/de
Publication of EP0197388A3 publication Critical patent/EP0197388A3/de
Application granted granted Critical
Publication of EP0197388B1 publication Critical patent/EP0197388B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/28—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing
    • B22C15/30—Compacting by different means acting simultaneously or successively, e.g. preliminary blowing and finally pressing by both pressing and jarring devices

Definitions

  • the invention relates to a method and a device for compressing foundry molding materials, the molding material being poured or pneumatically introduced into a molding device comprising a model device with one or more models, molding frames and filling frames, and subsequently by means of a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device is compacted and the entire or predominant molding sand present in the filling frame is moved into the molding frame.
  • a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device is compacted and the entire or predominant molding sand present in the filling frame is moved into the molding frame.
  • the strength of foundry molding materials is achieved by compacting the loose sand or pneumatically introduced molding sand into the mold frame.
  • the most important compression principles include shaking, vibrating presses, suction and shooting presses, high-pressure presses and, for some years now, pulse compression with compressed air or combustion of ignitable gas mixtures.
  • the present invention is based on the object of creating methods and devices for compacting foundry molding materials in which the compacting uniformity within a sand mold and thus also the quality of the casting is drastically improved.
  • a method for compressing foundry molding materials the molding material being poured or pneumatically introduced into a molding device consisting of a model device with one or more models, molding frame and filling frame, and subsequently by means of a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device and thereby moving all or most of the molding sand present in the filling frame into the molding frame
  • a compression transmitter consisting of a compressed air or combustion force pulse device or a pressing and / or vibrating device and thereby moving all or most of the molding sand present in the filling frame into the molding frame
  • the solution according to the invention ensures that loose areas are built up in partial, predeterminable areas of the molding material which lead to improvement of the mobility of the molding sand during the compression of the molding sand.
  • a compressed air introduced into the molding sand a will create loosenable areas depending on their strength, type of application and exposure time. Limitable loosening areas can also be created using a combustible or burned gas. If this is introduced into the molding sand in strong local concentration and ignited immediately, then explosively pronounced holes are obtained in the molding sand as a second type of reduced packing density and the sand is thus transported and compressed by the compressed gas in the sand.
  • the combustible mixture for example gasoline
  • the molding sand in such a way that it is initially distributed in a certain way and only then ignited, then there is only a weak combustion, with the result that the grains of sand stand out from one another and the molding material thus in reached an improved flowable state.
  • the type and amount of the combustible or burnt mixture, the place of introduction and the effect, in particular also the temporal effect, thus allow predeterminable areas of the loosening state and thus corresponding flowability of the molding sand to be created.
  • the expanding gas within the molding sand can be given a direction that determines the flowability of the molding sand.
  • the expanding gas within the molding sand is given an inflow direction which favors a direction of movement of the molding sand corresponding to the degree of difficulty of the model assignment or model execution.
  • the solution according to the invention of creating selected zones of reduced packing density during the compression by the compression transmitter using a gas in the compacting molding sand is possible with the various types of known compression transmitter.
  • the compression transmitter consists of an air pressure pulse device, then in most cases it is advantageous to choose compressed air as the expanding gas to create the loose areas in the molding sand and, if possible, to derive it from the compressed air of the compression transmitter.
  • the compression transmitter is thus a gas or is operated with one, then the gas to be introduced into the molding sand should advantageously also be of the same type in order to create the loose zones.
  • the compression transmitter consists of an internal combustion pulse device, an internal combustion engine can also be provided to create the loose areas in the molding sand.
  • the pulse devices for creating the loose areas in the molding sand can be derived from the pulse devices for compacting the molding sand. This has the advantage that the times of their effect can be coordinated precisely because, as has been mentioned many times, the loose areas in the molding sand are only created in the period of the compaction work and are no longer present at the end of the compaction work.
  • the compressed air pulse molding machine described by way of example in FIG. 1 consists of the model plate 1 with one or more models 2, the molding frame 3, the seated filling frame 4, in the embodiment according to the invention as a double frame with an all-round inner wall 5.
  • the inner wall 5 is provided with longitudinal slots 6, but can also be perforated in a different version with a plurality of holes.
  • the molding space is closed by the pressure chamber floor 7.
  • a large-area passage 8 for the pulse-triggering medium is at rest with egg NEM large valve 9, which is assumed in this example as a simple poppet valve, closed airtight by a pneumatically or hydraulically acting pressing device 10.
  • the pressure chamber 11 is formed by the housing 12, into which the compressed air supply line 13 opens.
  • the compressed air flow 14 comes from the compressed air supply to the foundry or a special compressor station.
  • pressure of 3 to 5 bar, for example, is stored in the pressure chamber 11.
  • the poppet valve 9 is torn up by triggering the pressing device 10.
  • the compressed air sleeps on the back of the mold 15 in a few milliseconds.
  • the loosely poured molding sand 16 is first pushed together in the region 17 of the back of the mold by the air blow and is already considerably compressed there.
  • This compression front 17 is reinforced by the continuously increasing compression pressure 18 until it leads to final compression at the moment of impact on model 2 and model plate 1 by backflow of the molding material.
  • the compressed air immediately after opening the valve 9 - indicated by arrows 21 - in the space between the double-walled filling frame 4 and 5 and all around the slots 6 laterally in the molding sand.
  • the sand Near the entire inner wall of the filling frame 5, the sand is kept loose during the predominant part of the compression, the wall friction remaining virtually eliminated.
  • the sand - as indicated by arrows 22 - slides increasingly into the critical edge areas 19, where there is considerably improved strength.
  • the extent of the surrounding loose zone 24 is u. a. determined by the viscosity of the compressed gas, the pressure and the slot width.
  • the slot width can be determined or changed according to the degree of difficulty of the model assignment 2 and the height of the molding box 3. For example, the slot widths should be designed to be much narrower for the passage of the hot fuel gases of the internal combustion pulse shaping machine than for the cold air of a compressed air pulse shaping machine. Inappropriately wide slots could push the gas too far into the bale and destroy the entire mold.
  • the filling frame 4 is also double-walled in this example.
  • the inner wall 25 consists of a circumferential, dense component and has a circumferential gap 26 at its lower edge.
  • the gas 15 flowing in between the walls 4 and 25 is directed by a likewise circumferential deflecting strip 27, which is rigidly connected to the parts 4 and 25, in a relatively narrow zone - as shown by arrows 28 - on the wall 25 upwards guided.
  • the effective range of this arrangement can be set very precisely by the gap width between the wall 25 and the deflection strip 27. With this arrangement it is also necessary to ensure that the back of the mold 23 comes to lie as close as possible or even below the upper edge of the deflection strip 27 after the compression.
  • the method according to the invention offers further possibilities which are suitable for a very precise timing of the loosening processes.
  • a corresponding device according to the invention is shown in FIG. 3.
  • the device according to FIG. 3 works with separate compressed air feeds for the compression pressure 18 and the loosening pressure 29.
  • the compressed gas required for loosening the inner mold areas in a localized manner is fed to the ring line 31 via the quick valve 30.
  • This arrangement is characterized by a high adaptability to changing operating conditions.
  • the loosening pressure can thus be applied shortly before the start of pulse compression.
  • the loosening air can be taken from the pressure vessel, for example, so that both air pressures are identical.
  • the compression pressure 18 rises to the level of the loosening pressure in the ring line 31, so that the pressure difference in the course of the compression constantly becomes smaller and ultimately zero. In this way, the loosening effect towards the end of the compression can be eliminated, which turns out to be advantageous in certain applications.
  • compressed air pulse compression according to FIG. 3 is designed for an all-round double row of nozzles and additional blowers which have proven themselves in large sand molds. Additional wind instruments are particularly advantageous when working with several and quite tall models as shown in FIG. 3. Even deep pockets in models which are arranged in central areas of the model plate 1 can be better shaped by means of additional blowing units.
  • the blower 32 is provided in the embodiment proposed here with a deflection device 33, which causes a cylindrical effective area 34 directed upwards.
  • a deflection device 33 which causes a cylindrical effective area 34 directed upwards.
  • other embodiments can also be selected with different knitting geometries and knitting strengths.
  • the optimal design must be adapted to the operating requirements.
  • the blower 32 can, as suggested in the exemplary embodiment in FIG. 3, be connected to the ring line 31 or also have a separate compressed air supply with its own control.
  • the action times of the various loosening devices can be provided in a very short and also staggered manner by using several quick valves.
  • FIG. 3 shows that the main directions of movement 22 of the molding sand during the compaction are influenced by the type and position of the various loosening devices, and thus a thoroughly improved compaction uniformity can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Press Drives And Press Lines (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Processing Of Solid Wastes (AREA)
  • Binders And Loading Units For Sheaves (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
EP86103822A 1985-03-28 1986-03-20 Verfahren und Vorrichtung zum Verdichten von Giessereiformstoffen Expired - Lifetime EP0197388B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86103822T ATE58659T1 (de) 1985-03-28 1986-03-20 Verfahren und vorrichtung zum verdichten von giessereiformstoffen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853511283 DE3511283A1 (de) 1985-03-28 1985-03-28 Verfahren und vorrichtung zum verdichten von giessereiformstoffen
DE3511283 1985-03-28

Publications (3)

Publication Number Publication Date
EP0197388A2 EP0197388A2 (de) 1986-10-15
EP0197388A3 EP0197388A3 (en) 1987-11-19
EP0197388B1 true EP0197388B1 (de) 1990-11-28

Family

ID=6266591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86103822A Expired - Lifetime EP0197388B1 (de) 1985-03-28 1986-03-20 Verfahren und Vorrichtung zum Verdichten von Giessereiformstoffen

Country Status (15)

Country Link
US (1) US4750540A (enrdf_load_stackoverflow)
EP (1) EP0197388B1 (enrdf_load_stackoverflow)
JP (1) JPS61226139A (enrdf_load_stackoverflow)
CN (1) CN86102948A (enrdf_load_stackoverflow)
AT (1) ATE58659T1 (enrdf_load_stackoverflow)
AU (1) AU584405B2 (enrdf_load_stackoverflow)
CA (1) CA1265313A (enrdf_load_stackoverflow)
DD (1) DD251300A5 (enrdf_load_stackoverflow)
DE (2) DE3511283A1 (enrdf_load_stackoverflow)
DK (1) DK143286A (enrdf_load_stackoverflow)
ES (2) ES8706055A1 (enrdf_load_stackoverflow)
HU (1) HU203296B (enrdf_load_stackoverflow)
IN (1) IN163736B (enrdf_load_stackoverflow)
MX (1) MX165572B (enrdf_load_stackoverflow)
ZA (1) ZA862271B (enrdf_load_stackoverflow)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271513A1 (de) * 1986-06-13 1988-06-22 Georg Fischer Aktiengesellschaft Verfahren und vorrichtung zum verdichten von körnigen formstoffen
CH671715A5 (en) * 1986-06-13 1989-09-29 Fischer Ag Georg Compacting casting moulds
CH672270A5 (enrdf_load_stackoverflow) * 1986-12-17 1989-11-15 Fischer Ag Georg
DE3701438A1 (de) * 1987-01-20 1988-07-28 Josef Mertes Engineering Fuer Verfahren und vorrichtung zum verdichten von kornfoermigen formstoffen z.b. giessereiformsand
CH675552A5 (enrdf_load_stackoverflow) * 1988-01-08 1990-10-15 Fischer Ag Georg
DE3836876C2 (de) * 1988-10-29 1994-06-09 Badische Maschf Gmbh Verfahren und Vorrichtung zum Verdichten von Gießerei-Formstoff
IT1225165B (it) * 1988-11-21 1990-11-02 Stern Giesserei Anlagen Gmbh Apparecchiatura per la compressione della terra di formatura nelle staffe di fonderia mediante impulsi di aria compressa.
DE3839475A1 (de) * 1988-11-23 1990-05-31 Boenisch Dietmar Verfahren und vorrichtung zum impulsverdichten von formsanden
RU1780917C (ru) * 1989-06-29 1992-12-15 Научно-Производственное Объединение Технологии Автомобильной Промышленности Способ изготовлени разовых литейных форм и устройство дл его осуществлени
DE3939001C1 (en) * 1989-11-25 1991-01-31 Georg Fischer Ag, Schaffhausen, Ch Mfr. of casting mould parts, with uniform hardness - uses machine with pattern plate, moulding frame and filling frame
CH682547A5 (de) * 1990-04-20 1993-10-15 Fischer Ag Georg Verfahren und Vorrichtung zum Verdichten von körnigen Formstoffen.
ES2048635B1 (es) * 1991-10-30 1996-07-01 Erana Agustin Arana Cabezal para maquinas de moldeo de cajas de arena por impacto de aire.
DE4208647C2 (de) * 1992-03-18 1995-06-29 Hottinger Adolf Masch Vorrichtung zum Schießen von Gießereikernen oder -formen mit Formstoffen
ES2115480B1 (es) * 1994-11-30 1999-02-16 Erana Agustin Arana Cabezal mejorado para maquinas de moldeo de cjas de arena con impacto de aire.
JP3226151B2 (ja) * 1995-12-15 2001-11-05 新東工業株式会社 ブロースクイズ式鋳型造型機
US5758708A (en) * 1996-10-04 1998-06-02 Ford Global Technologies, Inc. Method of making sand cores
DE102005057724B3 (de) * 2005-12-01 2007-02-01 Laempe & Mössner GmbH Verfahren und Vorrichtung zur Herstellung von Formen oder Kernen insbesondere für Gießereizwecke
JP5076670B2 (ja) * 2006-08-04 2012-11-21 新東工業株式会社 無枠鋳型造型機
ES2760927T3 (es) * 2007-07-13 2020-05-18 Advanced Ceramics Mfg Llc Mandriles basados en áridos para la producción de piezas de material compuesto y métodos de producción de piezas de material compuesto
US9314941B2 (en) 2007-07-13 2016-04-19 Advanced Ceramics Manufacturing, Llc Aggregate-based mandrels for composite part production and composite part production methods
CN104759595B (zh) * 2015-03-31 2016-10-19 青岛意特机械有限公司 微震压实式造型机及其造型方法
CN109865797A (zh) * 2019-03-14 2019-06-11 刘云峰 一种磁型铸造机
CN110216247B (zh) * 2019-07-17 2021-02-23 晋江鹏发机械有限公司 铸件粘土砂湿法造型工艺
CN111604479B (zh) * 2020-06-04 2021-08-27 山西博鹰铸造有限公司 一种消失模铸造用砂箱结构
CN115770858B (zh) * 2022-11-22 2023-11-03 无锡中叶合金制品有限公司 Ct皮带轮铸造型砂填充装置
CN118060498B (zh) * 2024-02-28 2024-08-27 河北青峰车体模具有限公司 一种铸造造型用振实压实装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB736315A (en) * 1952-09-08 1955-09-07 Allied Ironfounders Ltd A new or improved method of and apparatus for filling sand or other materials into core boxes, moulds, dies or the like
US3807483A (en) * 1971-01-08 1974-04-30 E Buhler Methods and apparatus for producing sand molds
SU471151A1 (ru) * 1973-03-14 1975-05-25 Завод Втуз При Московском Автозаводе Им.И.А.Лихачева Способ уплотнени формовочной смеси
JPS5247724A (en) * 1975-10-13 1977-04-15 Copal Co Ltd Camera shutter
JPS5317085A (en) * 1976-07-30 1978-02-16 Kinsekisha Lab Ltd Quartz vibrator
DE2814140A1 (de) * 1978-04-01 1979-10-11 Stotz Ag A Giessereiformmaschine
SU952414A1 (ru) * 1980-04-23 1982-08-23 Всесоюзный научно-исследовательский и проектно-технологический институт угольного машиностроения Способ изготовлени литейных форм "процесс ВМ-3
JPS58125339A (ja) * 1982-01-20 1983-07-26 Mitsubishi Heavy Ind Ltd 鋳型造型方法
DE3321955A1 (de) * 1983-06-18 1984-12-20 BMD Badische Maschinenfabrik Durlach GmbH, 7500 Karlsruhe Vorrichtung zum verdichten von giesserei-formstoff mittels druckgas

Also Published As

Publication number Publication date
AU5533886A (en) 1986-10-02
AU584405B2 (en) 1989-05-25
ES8800083A1 (es) 1987-10-16
ES8706055A1 (es) 1987-06-01
ATE58659T1 (de) 1990-12-15
ES557455A0 (es) 1987-10-16
ES553498A0 (es) 1987-06-01
DK143286D0 (da) 1986-03-26
ZA862271B (en) 1986-11-26
DD251300A5 (de) 1987-11-11
HUT45423A (en) 1988-07-28
CA1265313A (en) 1990-02-06
HU203296B (en) 1991-07-29
JPS61226139A (ja) 1986-10-08
EP0197388A2 (de) 1986-10-15
DK143286A (da) 1986-09-29
US4750540A (en) 1988-06-14
CN86102948A (zh) 1986-09-24
MX165572B (es) 1992-11-24
DE3511283A1 (de) 1986-10-09
IN163736B (enrdf_load_stackoverflow) 1988-11-05
DE3675800D1 (de) 1991-01-10
JPH0547307B2 (enrdf_load_stackoverflow) 1993-07-16
EP0197388A3 (en) 1987-11-19

Similar Documents

Publication Publication Date Title
EP0197388B1 (de) Verfahren und Vorrichtung zum Verdichten von Giessereiformstoffen
DE2653788C2 (de) Verfahren und Vorrichtung zum Herstellen von Gießformen aus bindemittelhaltigem Formsand
DE1097621B (de) Verfahren und Formmaschine zur pneumatischen Herstellung von Giessereikernen und Giessereiformen sowie Kasten hierfuer
EP3056297B1 (de) Verwendung eines speisereinsatzes und verfahren zum herstellen einer giessform mit vertikaler formteilung
EP0166228B1 (de) Einrichtung für die Durchführung des Vollformgiessverfahrens
DE2842912C2 (de) Verfahren und Vorrichtung zum Herstellen von Sandgießformen o.dgl.
DE1683921A1 (de) Verfahren und Vorrichtung zur Herstellung von Produkten aus keramischem Material
DE2752800A1 (de) Maschine zum herstellen von giessereiformen
DE3202395A1 (de) Verfahren und vorrichtung zum pneumatischen verdichten von formsand
DD238745A5 (de) Verfahren zur herstellung von formteilen
DE3319030C2 (enrdf_load_stackoverflow)
DE2933869C2 (de) Verfahren und Vorrichtung zum Herstellen eines unteren Formteils
DE2403199C3 (de) Verfahren und Vorrichtung zur Sandzufuhr und zur Sandverdichtung bei Formenschießmaschinen
DE2444377A1 (de) Verfahren und vorrichtung zur herstellung von formteilen fuer giessereien
WO1980002121A1 (en) Process device for compressing the material of a mould
DE1242802B (de) Verfahren zum Stampfen von Giessereisandformen und Giesserei-Formmaschine
DE2814140A1 (de) Giessereiformmaschine
DE1941736B1 (de) Verfahren bei kastenlosen Formmaschinen zum Einschiessen des Formsandes und Maschine zur Durchfuehrung desselben
DE3025993C2 (de) Formvorrichtung zur Explosionsverdichtung eines sandartigen Füllmaterials
EP0128336B1 (de) Vorrichtung zum Verdichten von Giessereiformsand
DE4319078C2 (de) Verfahren und Formherstellungsmaschine zur Herstellung von Gußformen oder Gußformteilen aus Formsand
EP0131723B1 (de) Vorrichtung zum Verdichten von Giesserei-Formstoff mittels Druckgas
DE3839475C2 (enrdf_load_stackoverflow)
DE3002702A1 (de) Vorrichtung an sandformmaschinen zum zufuehren des formsandes
DE2357309B2 (de) Preßform zur pulvermetallurgischen Herstellung von Kontaktdüsen für Schweißmaschinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19860320

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19880811

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: GEORG FISCHER AKTIENGESELLSCHAFT

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BOENISCH, DIETMAR PROF. DR.-ING.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 58659

Country of ref document: AT

Date of ref document: 19901215

Kind code of ref document: T

ET Fr: translation filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
REF Corresponds to:

Ref document number: 3675800

Country of ref document: DE

Date of ref document: 19910110

ITF It: translation for a ep patent filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19910331

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19930213

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19930215

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19930216

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19930219

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19930222

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19930223

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19930324

Year of fee payment: 8

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930331

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19940320

Ref country code: AT

Effective date: 19940320

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940321

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19940331

Ref country code: CH

Effective date: 19940331

Ref country code: BE

Effective date: 19940331

BERE Be: lapsed

Owner name: GEORG FISCHER A.G.

Effective date: 19940331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19941001

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19940320

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19941130

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19941201

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 86103822.2

Effective date: 19941010

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050320